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7th Grade Science

Folded Mountain

A mountain that forms as continental crust crumples and bends into folds

Fault-block Mountain

A mountain that forms where a normal fault uplifts a block of rock

Mountain Belt

Mountain ranges and mountain systems in a long connected chain.

Volcanoes

Openings in Earth's crust from which molten rock, dust, ash, and hot gases flow or erupt

Lava

Magma that reaches Earth's surface

Pyroclastic Flow

A hot, high-velocity mixture of ash, gas and fragmented rock that flows like a liquid down slopes and over terrain.

Shield Volcano

A low, flat, gently sloping volcano built from many flows of low-viscosity basaltic lava.

Cinder Cone Volcano

A steep, cone-shaped hill or small mountain made of volcanic ash, cinders, and bombs piled up around a volcano's opening

Composite Volcano

A tall, cone-shaped hill in which layers of high silica lava alternate with layers rock fragments.

Caldera

A large crater caused by the violent explosion of a volcano that collapses into a depression

Hot Springs

A pool formed by groundwater that has risen to the surface after being heated by a nearby body of magma.

Geyser

A fountain of water and steam that builds up pressure underground and erupts at regular intervals

Fumarole

A vent in a volcanic area from which fumes or gases escape

Deep-Sea Vent

A dark, hot, oxygen-deficient environment associated with volcanic activity on or near the seafloor spreading centers.

Magma

Molten rock beneath the earth's surface

Active

A volcano that is erupting or has erupted recently.

Dormant

A volcano that has not erupted recently, but may do so in the future.

Extinct

A volcano that will not erupt again.

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